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S000009189 [Member] Annual Fund Operating Expenses - S000009189 [Member]
Dec. 31, 2025
C000024974 [Member]  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.10%
Distribution and Service (12b-1) Fees 0.25%
Other Expenses (as a percentage of Assets): 0.13% [1]
Acquired Fund Fees and Expenses 0.39%
Expenses (as a percentage of Assets) 0.87% [2]
C000024976 [Member]  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.10%
Distribution and Service (12b-1) Fees 1.00%
Other Expenses (as a percentage of Assets): 0.13% [1]
Acquired Fund Fees and Expenses 0.39%
Expenses (as a percentage of Assets) 1.62% [2]
C000024977 [Member]  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.10%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.13% [1]
Acquired Fund Fees and Expenses 0.39%
Expenses (as a percentage of Assets) 0.62% [2]
C000122750 [Member]  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.10%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.09% [1]
Acquired Fund Fees and Expenses 0.39%
Expenses (as a percentage of Assets) 0.58% [2]
C000122751 [Member]  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.10%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.05% [1]
Acquired Fund Fees and Expenses 0.39%
Expenses (as a percentage of Assets) 0.54% [2]
C000251062 [Member]  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.10%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.13% [1]
Acquired Fund Fees and Expenses 0.39%
Expenses (as a percentage of Assets) 0.62% [2]
[1] Other expenses have been restated to reflect current fees paid by the Fund.
[2] “Total annual Fund operating expenses” include acquired fund (Portfolio Fund) fees and expenses (expenses the Fund incurs indirectly through its investments in other funds) and may be higher than the ratio of expenses to average net assets shown in the Financial Highlights section of this prospectus because the ratio of expenses to average net assets does not include Portfolio Fund (acquired fund) fees and expenses.